package com.zww.system.manager.controller;

import com.zww.system.manager.domain.Teacher;
import com.zww.system.manager.service.TeacherService;

import java.util.Scanner;

public class TeacherController {
    private Scanner sc = new Scanner(System.in);
    private TeacherService teacherService = new TeacherService();

    public void start() {
        teacherLoop:
        while (true) {
            System.out.println("-------欢迎来到《老师》管理系统-------");
            System.out.println("请输入您的选择: 1.添加老师 2.删除老师 3.修改老师 4.查看老师 5.退 出");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    addTeacher();
                    break;
                case "2":
                    deleteTeacherById();
                    break;
                case "3":
                    updateTeacher();
                    break;
                case "4":
                    findAllTeacher();
                    break;
                case "5":
                    System.out.println("感谢使用老师管理系统，再见");
                    break teacherLoop;
                default:
                    System.out.println("您输入有误，请重新输入");
                    break;
            }

        }
    }

    /*
     * 修改学生信息
     * */
    public void updateTeacher() {
        String id = inputTeacherId();
        Teacher newTeacher = new Teacher();
        // 调用业务员service类中的修改方法
        teacherService.updateTeacher(id, newTeacher);
        System.out.println("修改成功");
    }

    /*
     * 删除老师信息
     * */
    public void deleteTeacherById() {
        String id = inputTeacherId();
        // 2、调用业务员中的删除方法，根据id，删除老师
        teacherService.deleteTeacherById(id);
        System.out.println("删除老师信息成功");
    }

    /*
     * 查询所有老师的信息
     * */
    public void findAllTeacher() {
        // 从service业务员中，获取老师对象数组
        Teacher[] teachers = teacherService.findALLTeacher();
        // 判断数组是否有元素
        if (teachers == null) {
            System.out.println("查无信息，请稍后重试");
            return;
        }
        // 有元素，遍历数组，取元素打印
        System.out.println("学号\t姓名\t年龄\t生日");
        for (int i = 0; i < teachers.length; i++) {
            Teacher t = teachers[i];
            if (t != null) {
                System.out.println(t.getId() + "\t" + t.getName() + "\t" + t.getAge() + "\t\t" + t.getBirthday());
            }
        }
    }

    /*
    * 增加老师信息
    * */
    public void addTeacher(){
        String id;
        while (true){
            // 接收不存在的老师id
            System.out.println("请输入老师的id");
            id = sc.next();
            // 判断id是否存在
            boolean exists = teacherService.isExists(id);
            if(exists){
                System.out.println("id已经被占用，请重新输入：");
            }else{
                break;
            }
        }
        Teacher t = inputTeacherInfo(id);
        // 把封装好的老师对象t，传递给TeacherService继续完成添加操作
        boolean result = teacherService.addTeacher(t);
        if (result){
            System.out.println("老师信息添加成功");
        }else{
            System.out.println("信息添加失败");
        }
    }
    /*
    * 录入老师id
    * */
    public String inputTeacherId(){
        String id;
        while(true){
            System.out.println("请输入id");
            id = sc.next();
            boolean exists = teacherService.isExists(id);
            if(!exists){
                System.out.println("您输入的id不存在，请重新输入");
            }else{
                break;
            }
        }
        return id;
    }
    /*
    * 录入老师信息，封装为老师对象
    * */
    public Teacher inputTeacherInfo(String id){
        System.out.println("请输入老师的姓名");
        String name = sc.next();
        System.out.println("请输入老师年龄");
        String age = sc.next();
        System.out.println("请输入老师的生日");
        String birthday = sc.next();
        Teacher t = new Teacher();
        t.setId(id);
        t.setName(name);
        t.setAge(age);
        t.setBirthday(birthday);
        return t;
    }

}
